Seat and backrest of a stackable chair



FIG. 1 is a top perspective view of the seat and backrest of a stackable chair;

FIG. 2 is a bottom perspective view of the seat and backrest of a stackable chair;

FIG. 3 is a right side elevation view of the seat and backrest of a stackable chair;

FIG. 4 is a left side elevation view of the seat and backrest of a stackable chair;

FIG. 5 is a front elevation view of the seat and backrest of a stackable chair;

FIG. 6 is a rear elevation view of the seat and backrest of a stackable chair;

FIG. 7 is a top plan view of the seat and backrest of a stackable chair; and,

FIG. 8 is a bottom plan view of the seat and backrest of a stackable chair.

The broken lines shown in the figures are included for the purpose of illustrating environment only and form no part of the claimed design. 

CLAIM The ornamental design for a seat and backrest of a stackable chair, as shown and described. 